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C. diff Testing
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

C. diff Testing

C. diff testing identifies the presence of Clostridioides difficile bacteria or its toxins in stool samples to diagnose infections that cause severe diarrhea and colitis.

Overview

C. diff (Clostridioides difficile) is a bacterium that affects the large intestine. Infections often occur after taking antibiotics, which can disrupt the balance of good bacteria in the digestive system, allowing C. diff to grow out of control. The bacteria release toxins that irritate the colon, leading to symptoms ranging from mild diarrhea to life-threatening colitis.

When to Get Tested

Testing is recommended if you experience symptoms such as watery diarrhea (three or more times a day), abdominal pain, nausea, loss of appetite, or fever. You are at higher risk if you:

  • Have taken antibiotics in the last 6-8 weeks.
  • Are 65 or older.
  • Have recently stayed in a hospital or nursing home.
  • Have a weakened immune system.
  • Have had a previous C. diff infection.

The Testing Process

Patients must provide a fresh stool sample. It is critical that the sample is not contaminated with urine, toilet paper, or toilet water. Because C. diff toxins can break down quickly, samples should be kept cool and returned to the lab promptly according to provider instructions.

Understanding Results

  • Positive: Indicates the presence of C. diff toxins or toxin-producing genes, confirming an infection.
  • Negative: Suggests that C. diff is not the cause of your symptoms. However, a negative toxin test does not always rule out infection if the sample was not handled correctly.

Prevention and Management

Treatment may involve stopping the current antibiotic, starting a new antibiotic specifically for C. diff, and ensuring proper hydration. To prevent spreading the bacteria, always wash hands thoroughly with soap and water after using the bathroom and before eating. Inform all healthcare providers, including dentists, if you have a history of C. diff infection.

Frequently Asked Questions

negative result can sometimes be due to improper sample handling or low bacterial load. Discuss repeating the test with your clinician, consider other causes of diarrhea (e.g., other infections, food intolerance), and continue to monitor symptoms. If symptoms worsen or you develop fever or abdominal pain, seek medical attention promptly.
Probiotics may help support gut flora, but they do not diagnose or treat C. diff. Talk to your provider before starting any supplement, especially if you’re on antibiotics or have a weakened immune system, to ensure it’s safe and appropriate for your situation.===
Diarrhea that begins within 48–72 hours of antibiotic use and persists for more than three days is a red flag. If you notice watery stools, abdominal pain, or fever during this window, ask your clinician about a C. diff test.
Use a clean, dry container and avoid touching the inside with your hands. Do not let urine, toilet paper, or toilet water contaminate the sample. Keep the stool cool (e.g., in a refrigerator) and deliver it to the lab as soon as possible, following any specific instructions your provider gives.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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